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on the drawing force was investigated. The wear mechanisms of the ceramic drawing dies were investigated. Worn bore surfaces of the ceramic drawing dies were examined by scanning electron microscopy... investigation on lubricant choice and wear behavior, the wear behaviors on every zone in bore surfaces are analyzed and the best lubricant mediums are provided for reducing drawing force in order to offer......
深孔爆破采煤法在急倾斜薄及中厚煤层中的应用 黎锦贤1,刘荷根1,周国保1 (1.萍乡矿业集团公司,杨桥煤矿,江西,分宜,336614) 摘要:介绍深孔爆破采煤方法在煤层厚度不稳定的急倾斜煤层中的应用经验,详细说明了巷道布置方法,生产系统及回采工艺,并介绍了这种采煤方法的应用效果. 关键词:深孔爆破; 采煤方法; 煤厚不稳定; 急倾斜; [全文内容正在添加中] ......
增补转角场和剪应变场的厚薄板通用矩形单元 王海霞1,龙志飞1 (1.中国矿业大学 基础科学系,) 摘要:提出了建立厚薄板弯曲单元的新方法,它是利用已有优质薄板单元模式,并增补厚板单元的剪应变场和转角场的方式得到厚薄板弯曲通用单元.采用此方法导出的3个(12个自由度)厚薄板通用矩形元具有良好的计算精度和收敛性,且不产生剪切闭锁现象. 关键词:有限元; 厚薄板弯曲; 剪切闭锁; [全文内容正在添加中] ......
described the dynamic mechanical behavior of a rectangular plate under an impulsive loading was introduced. The formed parts of free bulging tests were analyzed using the optical measurement system. Two... through the formed bulges or sheared holes. The pressure distribution is indicated with a rectangular frame which is similar to the shape of the active area of the foil specimen. Therefore, the pressure......
="ChDivSummary"><正>A new hybrid method, Monte-Carlo-Heat-Flux (MCHF) method, was presented to analyze the radiative heat transfer of participating medium in a three-dimensional rectangular......
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of peak acceleration, acceleration curve, similarity of Fourier frequency spectra, and uneven soil settlement in rigid containers. Results show that the simulation effects of the boundary conditions are not only affected by the nature of the boundary material but also related to the seismic intensity, types of seismic waves, and filter characteristic of the filling medium in containers......
基于颗粒模型的二维矩形模腔粉末微注射成型研究 何浩1,李益民1,肖燕芳2,张建光1,刘煜2,夏卿坤2 (1.中南大学,粉末冶金研究院,长沙,410083;2.长沙学院,机电工程系,长沙,410003) 摘要:以颗粒模型理论为基础对粉末微注射成型二维矩形模腔填充过程进行模拟和分析,证明此方法是可行的,发现了粉末微注射成型的流动主要呈现环状波形效应,波形中心颗粒存在较大的挤压接触力,流动前沿的颗粒则较好地保留在界面前沿,未发生大的侧向位移. 关键词:粉末微注射成型; 颗粒模型; 波形效应; [全文内容正在添加中] ......
部分填充矩形截面环形磁芯的涡流损耗计算 马西奎1,张西波1,戴栋1 (1.西安交通大学电气工程学院,) 摘要:研究了部分填充矩形截面环形磁芯中的磁场,给出了填充材料边界处的条件,得到了涡流产生的磁场强度HΦ关于贝塞尔函数和三角基函数的双重级数的解析解,并计算了涡流损耗. 关键词:磁芯; 涡流; 解析解; [全文内容正在添加中] ......
弹性地基上钢筋混凝土矩形薄板的热屈曲 史晓宇1,杜永峰1,程选生1 (1.兰州理工大,土木工程学院,甘肃,兰州,730050) 摘要:基于薄板的小挠度理论和混凝土材料的非线性,根据弹性地基上钢筋混凝土矩形薄板在热载作用下的平衡方程和稳定方程,推导了弹性地基上四边简支钢筋混凝土矩形薄板在横向温度变化时临界屈曲温度变化的封闭解,得出了屈曲临界温度变化随初始弹性常数和长宽比的增大而减少,随基床系数,相对厚度和地温的增大而增大的变化规律. 关键词:弹性地基; 钢筋混凝土; 矩形薄板; 热屈曲; 横向变温; [全文内容正在添加中] ......